On the poking the bear point, I personally have never done that, so I have no idea what you are talking about
Way back in my Jujutsu days this sort of thing happened all the time, but for the most part it was all pretty friendly. However one day a senior student, a Brown belt, had recently won a golden gloves competition and came to class with an attitude, which he freely spread around to all of us younger less experienced students. Then he did something real stupid, he threw a punch at and hit sensei in the cheek, Sensei moved his head and went with the force but said nothing. Then at the end of class we always did some sparing and after all of us kids were done sensei said he felt like a bit of sparing today and called the golden gloves champ to the floor. The bow was the last time the golden gloves champ stood up for the next few minutes, He spent the entire match knocked down in various ways, getting up and being knocked down again.
A few months later the same guy won another match and again came to class and spread this attitude around the younger less experienced students but avoided hitting Sensei. He did however slap a couple of the younger students.... again he sparred sensei but at the end of that match he was asked to leave and told never return.
Some people seem to have a propensity to poking the bear